International Journal of Biodiversity / 2013 / Article / Tab 3

Research Article

Acacia sieberiana Effects on Soil Properties and Plant Diversity in Songa Pastures, Rwanda

Table 3

Light intensity measured at six locations (0, 7.5, 15, 20, 25 and 30 m) from Acacia sieberiana tree base in Songa pasture southern Rwanda. Upper table shows measurements expressed as % of light relative to open pasture; lower table measurements are expressed as photosynthetic photon flux density ( M m−2 s−1).

TimeSensor identity (distance from tree base, m)
1 (0)2 (7.5)3 (15)4 (20)5 (25)6 (30)

6:0038.462.684.899.497.3100.0
8:0039.360.083.698.799.2100.0
10:0035.761.584.195.496.0100.0
12:0037.268.285.399.499.9100.0
14:0037.260.188.398.499.9100.0
16:0037.760.181.098.5100.2100.0
18:0038.045.585.993.599.7100.0

Average37.659.784.797.698.9100.0
60.7*98.8**

6:00215.4351.2475.5557.4545.6560.7
8:00265.3405.5564.7666.9670.3675.5
10:00373.5642.4878.8997.61003.11045.2
12:00470.6862.41078.81257.21262.41264.2
14:00463.5748.91101.41227.41245.71246.9
16:00299.3477.7643.6782.4795.6794.4
18:00211.6253.5478.5521.2555.5557.3

Average328.5534.5745.9858.6868.3877.7
536.3*868.2**

Overall average light: *under tree canopy and **in open pasture.